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( Szu Jung Pan ),( Samuel Sudibyo Hadinata ),( Ruey Chy Kao ),( Wen Ta Tsai ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.5
The electrochemical behaviors of various metals with and without diamond-like-carbon (DLC) coating in 3.5 wt% NaCl solution were investigated. The effect of hydrodynamic conditions was focused by employing a rotating disc electrode (RDE). The experimental results showed that each bare metal had a more positive corrosion potential and a higher corrosion rate due to enhanced oxygen transport at the higher rotating speed of the RDE. DLC coating caused a substantial increase in the corrosion resistance of all metals studied.However, localized corrosion was still found in the DLC-coated metal at sites where deposition defects existed. Surface morphology examination was performed after the electrochemical test to confirm the roles of hydrodynamic conditions and DLC coating.
Behavior of Partially Concrete Encased Steel Beams Under Cyclic Loading
Cheng-Cheng Chen,Teguh Sudibyo,Erwin 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.1
This paper presents an experimental study of the behavior of partially concrete encased steel beams (PE beams) under seismic loading. The eff ects of a fl oor slab in providing lateral and torsional support to the strength and ductility of the beam are also investigated herein. One steel beam and six PE beams were tested herein. The strength development in bare steel beam was insuffi cient and signifi cant lateral torsional buckling (LTB) was observed. The concrete encasement of the PE beam delayed the occurrence of LTB and hence increased the strength and ductility of the beam. The plastic rotation capacity of PE beam is enhanced by the additional lateral and torsional support provided on the top of a PE beam. For the beam tested in this study, the concrete encasement permits the beam to reach its plastic strength and have plastic rotation of at least 3.42% rad, which is larger than 2% rad required for Intermediate Moment Frames, when no lateral or torsional support is provided at the top of the beam. To satisfy the 4% rad plastic rotation limitation for special moment frames, lateral support with suffi cient torsional stiff ness is needed.
Properties of Citric Acid-bonded Composite Board from Elephant Dung Fibers
( Ragil Widyorini ),( Greitta Kusuma Dewi ),( Widyanto Dwi Nugroho ),( Tibertius Agus Prayitno ),( Agus Sudibyo Jati ),( Muhammad Nanang Tejolaksono ) 한국목재공학회 2018 목재공학 Vol.46 No.2
An elephant digests only around 30~45% of what it consumes; therefore the undigested material mainly passes as intact fibres. Elephant food is usually composed of grass, leaves, twigs, bark, fruit and seed pods. This research aimed to utilize the elephant dung fibers as material for composite board and citric acid as a bonding agent. Citric acid contents in this research were set at 0 wt% (binderless composite board), 10 wt%, 20 wt%, and 30 wt% based on dry weight particles, while the target density was set at 0.8 g/cm<sup>3</sup>. Pressing temperatures were set at 180℃ and 200℃ with the pressing time was 10 minutes. Physical and mechanical properties tests were then performed according to Japanese Industrial Standard A 5905. The result showed that elephant dung fibers could be used as potential materials for composite board. Addition of citric acid and pressing temperature significantly increased the quality of composite board. Infrared analysis indicated that the presence of ester linkages much higher with the increasing of citric acid content and pressing temperature. The optimum properties of composite board made from elephant dung fibers could be achieved at pressing temperature of 200℃ and a citric acid content of 20 wt%.
( Nasronudin ),( M Inge Lusida ),( Brian Rachman ),( Musofa Rusli ),( Matoillah Isfandiari ),( Evhy Apryani ),( Vitanata Arfijanto ),( Sudibyo ),( Jt Tjahjana ),( Siswanto ),( Mj Reynolds ),( Umar F A 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Dengue infection is distributed throughout the tropical areas around the world, including Indonesia. Dengue fever/ dengue hemorrhagic fever is a mosquito- borne disease caused by dengue virus of any serotype 1 (DEN1) to DEN4. Until now, therapy is based on pathophysiology. Aims: To evaluate the effi cacy and safety of MAC for the treatment of dengue infection. Methods: This clinical trial phase III was designed to study the inhibitory property of MAC against dengue virus (DENV) activity. A double-blind, randomized, controlled trial method was approved by Ethical Committee of Dr. Soetomo Hospital. This study was conducted from January 2012 to November 2013. After a signed informed consent, 530 patients, fever on day-1 or day-2, suspected dengue infection according to WHO criteria, showed positive result either by NS-1, and or IgM - IgG, were recruited. The subjects were divided into 2 groups. Group I received WHO standard treatment and 300 mg - MAC twice daily orally for 7 days. Group II received WHO standard treatment only. History, physical examination and complete blood count were done every day. Laboratory test (liver function, kidney function, CD4, CD8, VCAM, viral load) were performed on the fi rst, fourth and seventh day. Results: The results showed that the quantity of virus signifi cantly decreased in the treatment group (96.67%) compared to the control group (44.79%). Also showed that MAC did improve the immune system by increasing the value of CD8 (6.89%) and CD4 (9.95%). MAC provision does not interfere with the function of liver and kidney, and was well tolerated by the patients. Conclusions: MAC has signifi cant reduction of viral load level, may have immunomodulatory effects, prevent the plasma leakage, no hepatotoxic and nephrotoxic effects. MAC effi cacy as an antiviral agent against DENV infection has been very effectively illustrated.